Service Manual. Microwave Oven. Model: KOM-9P2CBS. S/M No. : OM9P2CBS001. Caution

Transcription

1 S/M No. : OM9P2CBS001 Service Manual Microwave Oven Model: KOM-9P2CBS Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center ( May. 2012

2 PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches, (5) Evidence of dropping or abuse. (c) Before turning on power to the microwave oven for any service test or inspection within the microwave generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connections. (d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner. (e) A microwave leakage check to verify compliance with the federal performance standard should be performed on each oven prior to release to the owner. TABLE OF CONTENTS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY...1 SAFETY AND PRECAUTIONS FOR SAFE OPERATION FOR SAFE SERVICE PROCEDURES...2 SPECIFICATIONS...3 EXTERNAL VIEW OUTER DIMENSION FEATURES DIAGRAM CONTROL PANEL...6 INSTALLATION...7 OPERATIONS AND FUNCTIONS...8 DISASSEMBLY AND ASSEMBLY...9 INTERLOCK MECHANISM AND ADJUSTMENT...16 TROUBLESHOOTING GUIDE...17 MEASUREMENT AND TEST MEASUREMENT OF THE MICROWAVE POWER OUTPUT MICROWAVE RADIATION TEST COMPONENT TEST PROCEDURE...23 WIRING DIAGRAM...24 PRINTED CIRCUIT BOARD CIRCUIT CHECK PROCEDURE PCB CIRCUIT DIAGRAM P.C.B. LOCATION NO...29 EXPLODED VIEW AND PARTS LIST DOOR ASSEMBLY CONTROL PANEL ASSEMBLY GUIDE WIND ASSEMBLY TOTAL ASSEMBLY

3 SAFETY AND PRECAUTIONS CAUTION This device is to be Serviced only by Properly Qualified Service Personel. Consult the Service Manual for Proper Service Procedures to Assure Continued Safety Operation and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy. 1. FOR SAFE OPERATION Damage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking and may cause serious bodily injury to the operator. IF ANY OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE APPLIANCE. (Only a trained service personnel should make repairs.) (1) A broken door hinge. (2) A broken door viewing screen. (3) A broken front panel, oven cavity. (4) A loosened door lock. (5) A broken door lock. The door gasket plate and oven cavity surface should be kept clean. No grease, soil or spatter should be allowed to build up on these surfaces or inside the oven. DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN. The microwave oven has concealed switches to make sure the power is turned off when the door is opened. Do not attempt to defeat them. DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL. 2. FOR SAFE SERVICE PROCEDURES 1. If the oven is operative prior to servicing, a microwave emission check should be performed prior to servicing the oven. 2. If any certified oven unit is found to servicing, a microwave emission check should be performed prior to servicing the oven. (a) inform the manufacturer, importer or assembler, (b) repair the unit at no cost to the owner, (c) attempt to ascertain the cause of the excessive leakage, (d) tell the owner of the unit not to use the unit until the oven has been brought into compliance. 3. If the oven operates with the door open, the service person should tell the user not to operate the oven and contact the manufacturer and CDRH immediately. CAUTION MICROWAVE RADIATION PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE FROM THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS IMPROPERLY USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS. WAVEGUIDE FLANGES AND PASKETS MUST BE SECURE. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN SAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED. 2

4 SPECIFICATIONS POWER SUPPLY 240V AC, 50Hz SINGLE PHASE WITH GROUNDING INPUT POWER 1600 W MICROWAVE ENERGY OUTPUT 1100 W FREQUENCY 2,450MHz OUTSIDE DIMENSIONS (W H D) 542 x 329 x 461 mm CAVITY DIMENSIONS (W H D) 350 x 230 x 357 mm CAVITY VOLUME 29 L NET WEIGHT APPROX. 18 Kg TIMER 60 min. POWER SELECTIONS 5 Levels * Specifications are subject to change without notice. 3

5 EXTERNAL VIEW 1. OUTER DIMENSION

6 2. FEATURES DIAGRAM Safety Interlock System. 2 Door Viewing Screen - Allows viewing of food. The screen is designed so that light can pass through, but not the microwave. 3 Door Hook - When door is closed, it will automatically shut off. If the door is opened while the oven is operating, magnetron will immediately stop operating. 4 Oven Cavity. 5 Door Seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 6 Plate Tray - Made of special heat resistant GLASS. Food in a proper receptacle is placed on this plate for cooking. 7 Stirrer Cover - This is located on the ceiling with the stirrer fan. 8 Inlet cover - Protect the air hole from splashes of cooking foods. 5

7 3. CONTROL PANEL q w 1 MICROWAVE indicator, showing microwaving in progress. 2 DEFROST indicator, showing defrosting in progress. 3 PERCENTAGE of power indicator. 4 CHILD LOCK indicator. 5 PROGRAM - Used to save cooking data. 6 DEFROST - Used to defrost foods for time. 7 TIME SET PAD - Used to set the cooking time. 8 CHECK - Used to check cooking data. 9 DOUBLE QUANTITY - Used to extend programmed cooking time. 0 POWER - Used to set power level. q STOP/CLEAR - Used to stop the oven operation or to delete the cooking data. w START /+30SEC - Used to start the oven and also used to set a reheat time. 6

8 INSTALLATION 1. Steady, flat location This microwave oven should be set on a steady, flat surface. This microwave oven is designed for counter top use only. 2. Leave space behind and side All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually, cause failure. 3. Away from radio, and TV sets Poor television reception and radio interference may result if the oven is located close to a TV, radio, antenna, or feeder and so on. Position the oven as far from them as possible. 4. Away from heating appliances and water taps Keep the oven away from hot air, steam and splash when choosing a place to position it, or the insulation might be adversely affected and breakdowns occur. 5. Power supply Check your local power source. This microwave oven requires a current of approximately 7 amperes, Volts, 50 Hz. Power supply cord is about 1.0 meters long. Used the voltage must be the same as specified on this oven. Using a higher voltage may result in a fire or other accident causing oven damage. Using low voltage will cause slow cooking. We are not responsible for damage resulting from use of this oven with a voltage of ampere fuse other than those specified. This appliance is supplied with cable of special type, which, if damaged, must be repaired with cable of same type. Such a cable can be purchased from DAEWOO and must be installed by a qualified person. 6. Examine the oven after unpacking for any damage such as: A misaligned door, broken door or a dent in cavity. If any of the above are visible, DO NOT INSTALL, and notify dealer immediately. 7. Do not operate the oven if it is colder than room temperature (This may occur during delivery in cold weather.) Allow the oven to become room temperature before operating. EARTHING INSTRUCTIONS This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of the electric shock by providing an escape wire for the electric current. This appliance is equipped with a cord having a earthing plug. The plug must be plugged into an outlet that is properly installed and earthed. WARNING Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified electrician or service-man if the earthing instructions are not completely understood, or if doubt exists as to whether the appliance is properly earthed, and either : If it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade earthing plug, and a 3-slot receptacle that will accept the plug on the appliance. The marked rating of the extension cord should be equal to or greater than the electrical rating of the appliance, or DO NOT USE an extension cord. 7

9 OPERATIONS AND FUNCTIONS 11. Connect the mains lead to an electrical outlet. 12. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray must always be in place during cooking. 13. Close the door securely. 14. The oven door can be opened at any time during operation by pulling the door handle on the door. The oven will automatically shut off. To restart the oven, close the door and then touch the START pad. 15. Each time a pad is touched. a BEEP will sound to acknowledge the touch. 16. The oven automatically cooks on full power unless set to a lower power level. 17. The display will show : 0 when the oven is plugged in. 18. Time clock returns to the : 0 when the cooking time ends. 19. When the STOP/CLEAR pad is touched during the oven operation, the oven stops cooking and all information retained. To erase all information, touch the STOP/CLEAR pad once more. If the oven door is opened during the oven operation, all information is retained. 10. If the START pad is touched and the oven does not operate, check the area between the door and door is closed securely. The oven will not start cooking under the door is completely closed or the program has been reset. Make sure the oven is properly installed and plugged into the electrical. Wattage output chart The power level is set by touching the POWER pad. The chart shows the display, the power level and the percentage of power. Touch POWER pad. Power Level (Display) Approximate Percentage of Power once % twice 80 80% 3 times 60 60% 4 times 40 40% 5 times 20 20% 8

10 DISASSEMBLY AND ASSEMBLY Cautions to be observed when troubleshooting. Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely safe during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit. You are asked to observe the following precautions carefully. 1. Always remove the power plug from the outlet before servicing. 2. Use an insulated screwdriver and ware rubber gloves when servicing the high voltage side. 3. Discharge the high voltage capacitor before touching any oven components or wiring. (1) Check the grounding. Do not operate on a two-wire extension cord. The microwave oven is designed to be used while earthed. It is imperative, therefore, to make sure it is earthed properly before beginning repair work. (2) Warning about the electric charge in the high voltage capacitor. For about 30 seconds after the operation stopped and electric charge remains in the high voltage capacitor. When replacing or checking parts, short between oven chassis and the negative high terminal of the high voltage capacitor by using a properly insulated screwdriver to discharge. 4. When the fuse is blown out due to the operation of the monitor switch; replace primary interlock switch, secondary interlock switch and interlock monitor switch. 5. After repair or replacement of parts, make sure that the screws are properly tightened, and all electrical connections are tightened. 6. Do not operate without cabinet. SHORT CAUTION : Service personnel should remove their watches whenever working close to or replacing the magnetron. WARNING : When servicing the appliance, need a care of touching or replacing high potential parts because of electrical shock or exposing microwave. These parts are as follows - HV Transformer, Magnetron, HV Capacitor, HV Diode, HV fuse. 9

11 1. To remove cabinet 1) Remove four screws on cabinet back. 2) Pull the cabinet backward. 2. To remove door assembly 1) Remove three screws which secure the stopper hinge top. 2) Remove the door assembly from top plate of cavity. 3) Reverse the above for reassembly. NOTE : After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate. 10

12 3. To remove door parts. A05 A06 A09 A01 A10 A02 A05-2 A05-3 A05-1 DOOR ASSEMBLY : A07 A08 A04 A03 REF No. PART CODE PART NAME DESCRIPTION Q TY REMARK A DOOR AS KOM-9P2CBS 1 A DOOR PAINTING AS KOC-910K0S 1 A DOOR SEAL AS KOC-910K0S 1 A HOOK POM 1 A SPRING HOOK PW1 1 A DOOR SUB AS KOM-9P0C9S 1 A BARRIER-SCREEN *O TEMP GLASS T3.2 CLEAR 1 A HANDLE DOOR AL 1 A SCREW MACHINE PAN 4X10 MFZN 2 A STOPPER HINGE *T AS KOC-1B0K0S 1 A GASKET DOOR LUPOL ) Remove the gasket door from the door painting as. 2) Remove the barrier screen inner from the door painting as. 3) Remove the door sub as from the door painting as. 4) Remove the stopper hinge top as from the door painting as. 5) Remove the spring hook and the hook from the door painting as. 6) Remove the barrier screen outer from the door sub as. 7) Reverse the above steps for reassembly. 11

13 4. Method to reduce the gap between the door seal and the oven front surface. (1) To reduce gap located on part A Loosen two screws on the stopper hinge top, and then push the door to contact the door seal to the oven front surface. Tighten two screws. (2) To reduce gap located on part B Loosen two screws on the stopper hinge under, and then push the door to contact the door seal to the oven front surface. Tighten two screws. (3) To reduce gap located on part C Loosen the screw on the interlock switch assembly located the top of the oven body. Draw the interlock switch assembly inward as possible to engage with the hook on the door bottom. Tighten a screw. (4) To reduce gap located on part D Loosen the screw on the interlock switch assembly located the bottom of the oven body. NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm2. 12

14 5. To remove control panel parts. B03 B02 B01 B04 B05 C/PANEL ASSEMBLY : PKCPSWZZ12 REF No. PART CODE PART NAME DESCRIPTION Q TY REMARK B00 PKCPSWZZ12 CONTROL-PANEL AS KOM-9P2CBS 1 B CONTROL-PANEL ABS SG-175, SG-0760D 1 B SWITCH MEMBRANE KOM-9P2CBS 1 B DECORATOR C-PANEL STS430 T0.5 H/L 1 B SCREW TAPPING T2S TRS 4*12 MFZN 4 B05 PKMPMSB710 PCB MAIN MANUAL AS KOR-1P5C9S 1 1) Remove the screw which secure the control panel as, push up two snap fits and draw forward the control panel assembly. 2) Remove four screws which secure the PCB assembly to the control panel as. 3) Disconnect membrane tail from the connector of the PCB assembly. 4) Remove the PCB from the control panel sub as. 5) Reverse the above steps for reassembly. 13

15 6. To remove guide wind parts. C05 C02 C03 C04 C01 GUIDE WIND ASSEMBLY : REF No. PART CODE PART NAME DESCRIPTION Q TY REMARK C GUIDE WIND AS KOR-1P559S AMANA C GUIDE WIND PP 1 C MOTOR SHADED POLE 230V 50Hz OEM-15DWC2-C03 1 C SCREW TAPPING T2S PAN 4X30 MFZN 2 C FAN P.P GF20 1 C NOISE-FILTER DWLF-M07 1 1) Remove two screws for earthing and for fixing to rear-plate. 2) Remove the noise filter from the guide wind. 3) Pull the fan from the motor shaft. 4) Remove two screws which secure the motor shaded pole. 5) Remove the motor shaded pole. 6) Reverse the above steps for reassembly. 14

16 7. To remove high voltage capacitor. 1) Remove the screw which secure the grounding ring terminal of the H.V. diode and the capacitor holder. 2) Remove the H.V. diode from the capacitor holder. 3) Reverse the above steps for reassembly. High voltage circuit wiring 8. To remove magnetron. 1) Remove three screws which secure the magnetron. 2) Remove the magnetron. 3) Reverse the above steps for reassembly. NOTE : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mW/cm2 for a fully assembled oven with door normally closed. Metalic gasket plate Magnetron antenna Wave guide Magnetron antenna Stub Cooling fin Filament terminal <MAGNETRON> Metallic gasket plate 15

17 9. To remove wind guide assembly. 1) Remove the screw for earthing. 2) Remove the noise filter from the wind guide. 3) Remove the screw which secure the wind guide assembly. 4) Draw forward the wind guide assembly. 5) Pull the fan from the motor shaft. 6) Remove two screws which secure the motor shaded pole. 7) Remove the motor shaded pole. 8) Reverse the above steps for reassembly. 10. To remove H.V.transformer. 1) Remove four screws holding the H.V.transformer. 2) Remove the H.V.transformer. 3) Reverse the above steps for reassembly. 16

18 INTERLOCK MECHANISM AND ADJUSTMENT The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave. RD/BL RD/GY RD WH BK DOM SWITCH SECONDARY INTERLOCK SW (1) Primary interlock switch When the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate. When the door is closed, the hook pushes the button of the microswitch. Then the button of the primary interlock switch bring it under ON condition. (2) Secondary interlock switch and interlock monitor switch When the door is closed, the hook pushes the lock lever downward. The lock lever presses the button of the interlock monitor switch to bring it under NO condition. The lock lever presses the button of the secondary interlock switch to bring it under ON condition. ADJUSTMENT : Interlock monitor switch When the door is closed, the interlock monitor switch should be changed (NO condition) before other switches are closed. When the door is opened, the interlock monitor switch should be changed (NC condition) after other switches are opened. (3) Adjustment steps a) Loosen two mounting screws. b) Adjust interlock switch assembly position. c) Make sure that lock lever moves smoothly after adjustment is completed. d) Tighten completely two mounting screws. NOTE : Microwave emission test should be performed after adjusting interlock mechanism. If the microwave emission exceed 4mW/cm 2, readjust interlock mechanism. 17

19 TROUBLESHOOTING GUIDE Following the procedure below to check if the oven is defective or not. 1. Check grounding before trouble checking. 2. Be careful of the high voltage circuit. 3. Discharge the high voltage capacitor. 4. When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these parts and check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter. NOTE : When electric parts are checked, be sure the power cord is not inserted the wall outlet. Check wire harness, wiring and connected of the terminals and power cord before check the parts listed below. (TROUBLE 1) Oven does not operate at all ; any inputs can not be accepted. CONDITION CHECK RESULT CAUSE REMEDY Fuse blows. Check continuity of interlock monitor switch with door closed fuse Continuity No Continuity Malfunction of interlock monitor switch NOTE 1 Check continuity of of primary interlock switch contact with door partially open until interlock monitor switch contact close Continuity Shorted contacts of primary interlock switch. NOTE 1 Check continuity of primary winding of low voltage transformer 0Ωor infinite Approx Ω (normal) Defective low voltage transformer Disconnect one side of the lead wire connected form high voltage transformer to the high voltage capacitor and operate the unit Normal Fuse again blows Defective high voltage capacitor Defective high voltage transformer 18

20 CONDITION CHECK RESULT CAUSE REMEDY Outlet has proper voltage Fuse does not blow. Check continuity of magnetron Check continuity of power supply cord No Continuity No Continuity Defective magnetron Open power supply cord Normal Defective touch control circuit Display do not shown countdown Malfunction of secondary interlock switch NOTE All these switches must be replaced at the same time, please refer to Interlock Mechanism And Adjustment. (TROUBLE 2) Display shows all figures selected, but oven does not start cooking, even though desired program and time are set and start pad is tapped. CONDITION CHECK RESULT CAUSE REMEDY Oven lamp does not turn on Check continuity of primary interlock switch No Continuity Malfunction of primary interlock switch Adjust or replace Check continuity of secondary interlock switch No Continuity Malfunction of secondary interlock switch Adjust or replace Check D.C. voltage being supplied to RELAY (RY2) coil 0 V Defective touch control circuit Approx. 15 VDC Faulty contacts of RELAY (RY2) or open relay coil 19

21 (TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY No microwave oscillation Check continuity of high voltage capacitor terminals with wires removed Continuity Defective high voltage transformer Check continuity of high voltage rectifier in forward and backward direction with DC megger Continuity in backward direction Defective high voltage rectifier Connect megger leads to magnetron terminal and magnetron body Continuity Defective magnetron Check resistance of primary and secondary coil of high voltage transformer 0 Ωor Defective high voltage transformer Check continuity of magnetron with wires removed No Continuity Defective magnetron Check continuity of filament terminal of high voltage transformer No Continuity Defective high voltage transformer Check D.C. voltage being supplied to RELAY (RY1) coil 0 V Defective touch control circuit Approx 15 VDC Faulty contacts or RELAY (RY1) or open relay coil 20

22 (TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit 1. Incomplete segments, 1) Segments missing. 2) Partical segments missing. 3) Digit flickering other than normal display slight flickering. 4) " :0" does not display when power is on. 2. A distinct change in the display are not on when they numbers is the display. 3. One or more digits in the display are not on when they should be. 4. Display indicates a number different from one touched. 5. Specific numbers (for example 2 or 3) will not display when the panel is touched. 6. Display does not count down or up with time cooking or clock operation. 7. Oven is programmable and cooks normally but no display shows. 8. Display obviously jumps in time while counting down. 9. Display counts down noticeably too fast while cooking. 10. Display does not show the :0 when the STOP/CLEAR pad is touched. 11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the RELAY 2 contacts close. If they close, replace P.C.B assembly. CONDITION CHECK RESULT CAUSE REMEDY Display does not show programming at all, even if keyboard is touched. Check each pad for continuity of the membrane keyboard for the following keyboard check procedure Normal Malfunction of the control circuit board the control circuit board Abnormal Malfunction of the membrane keyboard the membrane keyboard NOTE Before following the particular steps listed above in the troubleshooting guide for the failure of membrane keyboard, please check for the continuity of each wire-harness between the membrane keyboard and P.C.B. assembly. 21

23 MEASUREMENT AND TEST 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below. PROCEDURE 1. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 3mm, an external diameter of approximately 190mm and a height of approximately 90mm. The mass of the container is determined. 2. At the start of the test, the oven and the empty container are at ambient temperature. Water having an initial temperature of 10 C ± 1 C is used for the test. The water temperature is measured immediately before it is poured into the container. 3. A quantity of 1000g ± 5g of water is added to the container and its actual mass obtained. The container is then immediately placed in the centre of the oven shelf, which is in its lowest normal position. The oven is operated and the time for the water temperature to attain 20 C ± 2 C is measured. The oven is then switched off and the final water temperature is measured within 60s. NOTE 1 - The water stirred is before its temperature is measured. NOTE 2 - Stirring and measuring devices are to have a low heat capacity. 4. The microwave power output is calculated from the formula P = {4,187 mw(t2-t1) mc (T2-T0)}/t where P is the microwave power output, in watts ; mw is the mass of the water, in grams ; mc is the mass of the container, in grams ; T0 is ambient temperature, in degrees Celsius ; T1 is the initial temperature of the water, in degree Celsius ; T2 is the final temperature of the water, in degrees Celsius ; t is the heating time, in seconds, excluding the magnetron filament heating-up time. The microwave power output is stated in watts, rounded off to the nearest 50W CAUTION 1. Water load should be measured exactly to 1 liter. 2. Input power voltage should be exactly specified voltage (Refer to SPECIFICATIONS). 3. Ambient temperature should be 20 ± 2 C (68 ± 3.6 F) Heating time for power output: (T2 = T0) A (second) B (W)

24 2. MICROWAVE RADIATION TEST CAUTION : 1. Make sure to check the microwave leakage before and after repair of adjustment. 2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy. 3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known. 4. Care should be taken not to place the eyes in direct line with the source of microwave energy. 5. Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test. PROCEDURES 1. Prepare Microwave Energy Survey Meter, 600cc glass beaker, and glass thermometer 100 C(212 F). 2. Pour 275cc±15cc of tap water initially at 20±5 C(68±9 F) in the 600cc glass beaker with an inside diameter of approx. 95mm(3.5in.). 3. Place it at the center of the tray and set it in a cavity. 4. Close the door and operate the oven. 5. Measure the leakage by using Microwave Energy Survey Meter with dual ranges, set to 2450MHz. 1) Measured radiation leakage must not exceed the value prescribed below. Leakage for a fully assembled oven with door normally closed must be less than 4mW/cm 2. 2) When measuring the leakage, always use the 5cm(2in.) space cone with probe. Hold the probe perpendicular to the cabinet and door. Place the space cone of the probe on the door, cabinet, door seem, door viewing screen, the exhaust air vents and the suction air vents. 3) Measuring should be in a counter-clockwise direction at a rate of 1 in./sec. If the leakage of the cabinet door is unknown, move the probe more slowly. 4) When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 in. from any metal. If it does not, erroneous reading may result. 23

25 3. COMPONENT TEST PROCEDURE High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. It is neither necessary nor advisable to attempt measurement of the high voltage. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor. 1. High voltage transformer (1) Remove connections from the transformer terminals and check continuity. (2) Normal readings should be as follows: Secondary winding...approx Ω±10% Filament winding...approx. 0Ω Primary winding...approx Ω 2. High voltage capacitor (1) Check continuity of capacitor with meter on the highest OHM scale. (2) A normal capacitor will show continuity for a short time, and then indicate 10MΩonce the capacitor is charged. (3) A shorted capacitor will show continuous continuity. (4) An open capacitor will show constant 10MΩ. (5) Resistance between each terminal and chassis should be infinite. 3. High voltage diode (1) Isolate the diode from the circuit by disconnecting the leads. (2) With the ohmmeter set on the highest resistance scale measure the resistance across the diode terminals. Reverse the meter leads and again observe the resistance reading. Meter with 6V, 9V or higher voltage batteries should be used to check the front-back resistance of the diode, otherwise an infinite resistance may be read in both directions. A normal diode s resistance will be infinite in one direction and several hundred KΩin the other direction. 4. Magnetron For complete magnetron diagnosis, refer to Measurement of the Microwave Power Output. Continuity checks can only indicate and open filament or a shorted magnetron. To diagnose for an open filament or a shorted magnetron. (1) Isolate magnetron from the circuit by disconnecting the leads. (2) A continuity check across magnetron filament terminals should indicate 0.1Ωor less. (3) A continuity check between each filament terminal and magnetron case should read open. 5. Fuse If the fuse in the primary and monitor switch circuit is blown when the door is opened, check the primary and monitor switch before replacing the blown fuse. In case the fuse is blown by an improper switch operation, replace the defective switch and fuse at the same time. just the fuse if the switches operate normally. 6. Interlock switches (1) You can test continuity of safety interlock and monitor switch by using ohmmeter. (2) The switch operation is checked by zero/unlimited. The meter should indicate zero resistance. (3) The sequence of check is interlock monitor switch, primary and secondary interlock switches check. 24

26 WIRING DIAGRAM 25

27 PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1. Low voltage transformer check The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 230V / Frequency: 50Hz Terminal Voltage 6-7, LOAD DC 12V AC 3.4V NO LOAD AC 26.0V AC 4.0V NOTE : 1. Refer to Ciruit Diagram (point 4). 2. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage. 3. The allowable tolerance of the secondary voltage is within 5% of nominal voltage. 2. Voltage Check NO CHECK POINT REMARK 1 IC1 PIN 63, 64 5VDC 2 IC1 PIN 38 5V 0V T T:20ms(50Hz) 3 IC1 PIN 33 OR 34 5V 0V T T:250ns(4MHz) Check method NO MEASURE POINT WAVE FORM REMEDY REMARK 1 MP1 DC 5V±0.25V Q9, ZD2, EC2, R21, C3 NO LOAD 2 MP2 DC 12V±2.0V D12, D13, EC4, EC5, R22,C7 NO LOAD NOTE : Each measure point must be measured with GND points. 26

28 MP1 MP2 Measure Point 27

29 3. When there is no microwave oscillation 1) When touching START pad, oven lamp does not turn on. Fan motor do not rotate, but cook indicator in display comes on. * Cause : RELAY 2 does not operate. refer to Circuit Diagram (Point 3) - Check method STATE POINT A B RELAY 2 ON 2.5VDC GND RELAY 2 OFF GND 12VDC 2) When touching START pad, oven lamp turns on. Fan motor and turntable rotate and cook indicator in display comes on. * Cause : RELAY 1 does not operate. refer to Circuit Diagram (Point 2) - Check method STATE POINT A B RELAY 1 ON 5VDC GND RELAY 1 OFF GND 12VDC 4. When the door is opened during operation, the count down timer does not stop. refer to Circuit Diagram (Point 1) -Check method STATE POINT A B 1) DOOR OPEN OPEN 5VDC 2) DOOR CLOSED CLOSE GND CHECK NO METHOD REMEDY 1 Check the stage (ON, OFF) of the door open monitor switch by door open monitor resistance measurement. switch. 5. When the digital clock does not operate properly. refer to Circuit Diagram (Point 5) POINT WAVE FORM 1 0V -5V T T:20ms(50Hz) * If clock does not keep exact time, you must check resistor R16, R23, transistor Q5. 28

30 2. PCB CIRCUIT DIAGRAM DMR-1P5FS 29

31 3. PCB LOCATION NO. NO NAME SYMBOL SPECIFICATION PART CODE Q TY 1 BUZZER BZ1 BM-20K (BUJEON) C CERA C1~9 HIKF 50V 0.1MF Z AXIAL CCZF1H104Z 9 3 C ELECTRO EC1 50V RS 0.1MF (5X11) TP CEXE1H108A 1 4 C ELECTRO EC2 50V RS 10MF (5X11) TP CEXE1H100A 1 5 C ELECTRO EC3 50V RS 2.2MF (5X11) TP CEXE1H229A 1 6 C ELECTRO EC4 35V RSS 220MF (10X12.5)TP CEXF1V221V 1 7 C ELECTRO EC5 35V RSS 1000MF (13X25) TP CEXF1V102V 1 8 C ELECTRO EC6 50V RSS 100MF (8X11.5) TP CEXF1H101V 1 9 C ELECTRO EC7 50V RSS 220MF (10X16) TP CEXF1H221V 1 10 CONN FILM CN2 FCZ M CONN WAFER CN1 YW396-02V(YEONHO) CONN WAFER CN3 YW396-07AV(YEONHO) DIGITRON DP1 HNM-07MS12 DHNM07MS DIODE D1~7,9~11 1N4148 AUTO 52MM DZN DIODE D12~15 KN4004A AUTO 52MM DZN4004A DIODE ZENER ZD1 UZ-3.9BSB( ) DZUZ3R9BSB 1 17 DIODE ZENER ZD2,4 UZ-5.6BSB( V) DZUZ5R6BSB 2 18 DIODE ZENER ZD3 UZ-24BSB( V) DZUZ24BSB HOLDER VFD DPH NYLON IC EEPROM IC2 CAT24WC02 14HN24WC IC MICOM IC1 TMP87CM14N-6CG3 13GS1P5C PCB MAIN BOARD M R ARRAY RA2 RGLD4X104J (MURATA) RA-85X104J 1 24 R ARRAY RA3 6P(5) 1/8 100K OHM J RA-86X104J 1 25 R CARBON FILM R1,2,5,11,16 1/6 10K OHM J RD-AZ103J R CARBON FILM R14 1/6 4.7K OHM J RD-AZ472J R CARBON FILM R17 1/6 100 OHM J RD-AZ101J R CARBON FILM R18,23 1/6 47K OHM J RD-AZ473J R CARBON FILM R22,24 1/2 27 OHM J SMALL RD-2Z270JS 2 30 R CARBON FILM R25 1/4 6.8 OHM J RD-4Z689J R CARBON FILM R3 1/6 1M OHM J RD-AZ105J R CARBON FILM R4,6,7,9,10,12,13,15,19~21 1/6 1K OHM J RD-AZ102J R CARBON FILM R8 1/6 200 OHM J RD-AZ201J RESONATOR CERA CR1 CRT 4.00MS 5P4R00MTS SW RELAY RY1 G5G-1A 1C 1P DC12V 5SC SW RELAY RY2,3 OJ-SS-112LM 1C 1P 5SC TR Q1,6 KTA1266Y- (2SA1980NYATPF) TZTA1266Y TR Q3~5 KRC106M(AUTO) TZRC106M TR Q7~9 KTC3198GR (1815GR) TZTC3198GR 3 40 TRANS POWER LVT1 DMR-1P5FS 5EPV WIRE COPPER J1~3,5,8 1/0.52 TIN COATING GY 5 42 WIRE COPPER J4 1/0.52 TIN COATING GY 1 43 WIRE COPPER J6,7,9~13 1/0.52 TIN COATING GY 7 30

32 EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to Disassembly and assembly. 2. CONTROL PANEL ASSEMBLY Refer to Disassembly and assembly. 3. GUIDE WIND ASSEMBLY Refer to Disassembly and assembly. 4. TOTAL ASSEMBLY F01 F19 F20 F02 F46 F45 F51 F04 F05 F03 F43 F44 F41 F46 F50 F06 F40 F07 F09 F35 F39 F38 F49 F47 F42 F36 F48 F18 F24 F27 F37 F34 F17 F11 A00 F12 F13 F16 F14 F15 B00 F10 F08 F28 F29 F22 F31 F21 F30 F33 F32 F26 F23 F25 31

33 REF. NO PART CODE PART NAME DESCRIPTION Q'TY A DOOR AS KOM-9P2CBS 1 B00 PKCPSWZZ12 CONTROL-PANEL AS KOM-9P2CBS 1 F CAVITY AS KOM-9P0C9S 1 F MOTOR SYNCRO SM16F -HK36T1FY 1 F SCREW TAPPING T2S PAN 4X6 MFZN 1 F STIRRER BLADE AL050-H18 T0.7 1 F COUPLER STIRRER PPS 1 F COVER STIRRER PP 1 F H50000 FIXTURE AS KOG-36150S 1 F COVER HOLE *I PP 1 F TRAY AS KOM-9P0C9S TRAY CEILING 1 F HARNESS MAIN KOM-9P0C9S 1 F LOCK PP 1 F LEVER LOCK POM 1 F LEVER SW MICRO POM,KOG-846T0S 1 F14 5S762G10G0 SW MICRO SZM-V16-FD-63 S (200G) 1 F SWITCH PUSH V0303A2 / MP101C 1 F A66910 SW MICRO VP-531A-OF/SZM-V16-FA-61 2 F LAMP BL 240V 25W T25 C7A H187 1 F SCREW TAPPING T2S TRS 4*12 MFZN 2 F THERMOSTAT OFF:85 ON:50 H #187 1 F SCREW TAPPING T2S PAN 4X6 MFZN 1 F BASE SBHG T0.8 1 F FOOT DASF F CAPACITOR HV 2300V 1.15UF #187 CLASS P 85MM 1 F24 441X HOLDER HV CAPACITOR SECC 0.8T 1 F DIODE HV AS HV MA 12000V #187 1 F FUSE HV 5KV 1A 1 F27 7S432X4081 SPECIAL SCREW TT3 TRS 4X8 SE MFZN 1 F STOPPER HINGE *U AS KOR-121M0A 1 F SCREW TAPTITE TT3 TRS 4X8 MFZN 1 F FOAM CR 6TX220X30 1 F31 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 6 F TRANS HV R9S59A DS30 1 F SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 4 F MAGNETRON 2M248H(DW)-B 1 F35 7S627W50X1 NUT HEX NUT FLANGE M5X0.8P MFZN 4 F THERMOSTAT OFF:160 ON:115 H #187 1 F SCREW TAPPING T2S PAN 3X6 MFZN 2 F GUIDE WIND PP 1 F MOTOR SHADED POLE 230V 50HZ OEM-15DWC2-C03 1 F SCREW TAPPING T2S PAN 4X30 MFZN 2 F NOISE-FILTER DWLF-M07 1 F FAN P.P GF20 1 F COVER HOLE *O SBHG T0.8 1 F SCREW TAPPING T2S TRS 4*12 MFZN 1 F QM5 CORD POWER AS 3X1.0 80X RTML RUBBER(UK) 1 F SCREW TAPPING T2S TRS 4*10 MFZN 1 F SCREW TAPPING T2S TRS 4*12 MFZN 1 F SCREW TAPPING T2S TRS 4*8 MFZN 1 F SCREW TAPTITE TT3 TRS 4X8 MFZN 3 F CABINET STS 430 NO4 T0.5 1 F51 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 4 32

34 DAEWOO ELECTRONICS CORP. 1-2, Jeo-dong 1(il)-ga, Jung-gu, Seoul, Korea C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K CABLE: DAEWOOELEC S/M NO. : OM9P2CBS001 PRINTED DATE: May. 2012

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